<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            width: 100px;
            height: 100px;
            background-color: lightcoral;
            margin: 100px auto 0;
            transition: 600ms;
            border-radius: 30px;
        }
        div:hover{
            transform: scale(85%);
            border-radius: 50px;
            background-color: #0aa5d6;
        }
    </style>
</head>
<body>
<div></div>
</body>
</html>